Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The elephant shrew’s closest relative isn’t a shrew — it’s actually an elephant
9
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20